diff --git a/handler.go b/handler.go
index f211f54..11f1f21 100644
--- a/handler.go
+++ b/handler.go
@@ -41,7 +41,7 @@ func ClaudeCodeHeaders(apiKey, sessionID string) map[string]string {
 		"x-api-key":                apiKey,
 		"x-app":                    "cli",
 		"anthropic-version":        "2023-06-01",
-		"anthropic-beta":           "interleaved-thinking-2025-05-14,prompt-caching-scope-2026-01-05,context-management-2025-06-27",
+		"anthropic-beta":           "claude-code-20250219,interleaved-thinking-2025-05-14,prompt-caching-scope-2026-01-05,context-management-2025-06-27,redact-thinking-2026-02-12",
 		"X-Claude-Code-Session-Id": sessionID,
 		"content-type":             "application/json",
 	}